Okay, Eddie is in the freezer because Frank got sick of Eddie getting attention (also the reason he killed him) so he decided to use half of Eddies brain to make Rocky. He says this when he's talking to Magenta and Riff right before the Fan Fair scene, "Rocky's behaving just the way that Eddie did. Do you think it was a mistake splitting his brain between the two of them?" Columbia has no say so in what Frank does with Eddie, she's just a groupie.

Some of these aren't slip ups but questions. Some can be answered quite easily by a true RHPS fan. Like the fact that Dr. Scott can use his legs. He's being manipulated...if you're under a spell you can do almost anything. And Frank's tattoo smears because, if you didn't notice, it's not SUPPOSED to be a tattoo...it's just paint. He doesn't have it anywhere else in the movie.
OK...I'm done...

When Frank makes that face in the pool, not only is there an underwater shot of Frank getting a kick in the nads, but if you look carefully, Janet(when singing 'God Bless Lilly St. Cyr') nudges her shoulder into his chin, and he almost bites his tongue off! Poor Frank goes through a helluva lot of pain for one song!

Eddie had been Franks original "perfect man" but he fell in love with Columbia so Frank put him into the freezer so that he can use his parts later on to make another perfect man. (at least this is how my friend explained it too me when I asked the same question after the first time I watched the movie)

Ok, the expression on Frank's face after he kisses Janet's neck (at 1hr 19mins 48secs on the DVD) is quite amusing, but the one when she sings is not at all amusing.
Also, and please correct me if I'm being dim here, I don't think these are slip ups. The one where she sings for him is certainly scripted. The neck kisser....well, it might be a slip up I suppose, if Susan Sarandon tastes particularly nasty.

The floor show, when Dr.Scott is flailing his legs around, this is NOT a slip-up. It was obviously scripted, the whole point of moving his legs was because he is in a wheelchair. The floor show is done with everyone in some sort of trance, doing things and saying things they never thought they could.

No No No....That face in the pool was made because Susan Sarandon has nasty tastin' pits...The other one that I did notice was in the dinner scene (when they were eating Eddie) after Frank slaps Janet and runs after her. Brad takes his glasses off, throws them on the table, and then proceeds to follow Frank and Janet. I laugh about that every time I watch it!

Frank makes the face in the pool because Rocky was going underneath him to get him in his shoulders when they continue the song. He said it was uncomfortable in an interview. I also heard somewhere else (and have seen it too) when Janet and Brad are backing away from Frank when he's going to sing I'm Going Home, Janet stands on Brads foot (remember they're wearing heels!!) and you see him flinch and recover quickly..hehe, that one makes me laugh everytime...

The reason Frank does that face in the pool is because as the song is dying down, Janet sings, "God bless Lilly.... (something something)"
I assume it was over a referance to God, being he was going to call them a "Satanic Mechanic" earlier.